62 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[232 



ps Pseudotrachea 



ps.th Pseudotracheal thickening 



pt Ptilinum 



r.d.a Rudimentary dorsal arms of the 



tentorium 



r.p.a Rudimentary posterior arms of 



the tentorium 



s Suture 



s.b Salivary bulb 



sc Scape 



s.d Salivary duct 



s.e.s Stem of the epicranial suture 



si Sigma (sclerite) 



